258 Berry: Mesozoic flora of the coastal plain 



Citrophyllum gen. nov. 



Fossil spermatophytes with elliptical to ovate or ovate-lanceo- 

 late, coriaceous leaves, with entire or slightly undulate margins 

 and stout conspicuously alate petioles. Secondary venation fine, 

 more or less immersed, regular, camptodrome. Embracing leaves 

 of the same general character as those of the modern genus 

 Citrus and very similar to them. 



Citrophyllum aligerum (Lesq.) comb. nov. 



Ficus aligera Lesq. Fl, Dakota Group 84. //. /o. /. J -^. 1 892.- 



Berry, Rep. State Geologist [N. J.] for 1905, 139. 1906; 



Bull. Torrey Club 33: 172. 1906. 



Leaves small, elliptical to ovate or ovate-lanceolate, coriaceous, 

 varying from 2.5 to 6 cm. in length by 1.8-3.2 cm. in breadth. 

 Margin entire, occasionally slightly undulate. Apex rounded or 

 obtusely acuminate. Base rounded, subtruncate or cuneate. Peti- 

 ole stout, 0.7-2 cm. in length, conspicuously alate. The petiolar 

 wings may be oblong-lanceolate or obovate ; together they are 

 from 2.5 to 5 mm. in width, averaging about 3.5 mm. Midrib 

 stout. Secondaries fine, more or less obscured by the coriaceous 

 leaf-substance, about 9 alternate pairs, branching from the midrib 

 at angles of from 45 to 50°, parallel, camptodrome. [P 

 FIGURES 1-8, ~ 



These curious leaves were described by Lesquereux from the 

 Dakota group as a species of Ficus and compared with Ficus 

 hu)fielioides Ettings. and Fictis Mudgei Lesq., neither of which has 

 alate petioles, while the first has an emarginate apex. Subsequently, 

 the same leaves Avere found in the Magothy formation of New 

 Jersey and only recently a single small leaf was found in the Upper 

 Raritan beds of South Amboy. They exhibit considerable vari- 

 ability in outline, but all have exactly the same aspect and con- 

 spicuous alate petioles. They appear to be related to the leaves 

 of the modern genus Citrus. The latter have exactly the same 

 texture and venation, the same variability in outline and marginal 

 undulations, the same stout midrib and conspicuously alate petioles. 

 In examining a suite of specimens oi the latter and comparing 

 them with the fossils, the conclusion seems to be irresistible that 

 they are related and the writer has consequently referred the 

 fossils to a new genus with a name that emphasizes this rela- 

 tionship to the modern genus. All of the fossil specimens that are 



